Well, I feel fucking stupid. While getting rid of some textures I didn't need, I accidentally deleted the textures to the refugees form HL2. If any Good Samaritans want to help out, that would be funtubularbs (That's gibberish for fantastic.)

that's real weird, cause unless you have an invalid vtf with the same name, gmod should refer to the gcf if it cannot find that file. so this might mean well
Garry Newman says he wants his 10 dollars back

that's real weird, cause unless you have an invalid vtf with the same name, gmod should refer to the gcf if it cannot find that file. so this might mean well
Garry Newman says he wants his 10 dollars back

Weird, I bought my game, and most of this content is from garrysmod.org. I don't pirate, so this is real weird. Any suggestions on what to do?

I believe gm_bigcity uses a few materials from CS:S, but it doesn't actually have you extract those into your garrysmod folder, and any custom materials are packed into the .bsp.
Your best bet is to do what Kabs suggested.
Get GCFScape and extract the content of source materials.gcf into your \garrysmod\garrysmod folder.

Unfortunately, I had to copy my entire Garry's Mod to a separate file an re-install the game, I have it copied to several drives, so I should find a way to fix my game, as there was definitely something worse going on, as well. A large amount of textures have dissapeared into oblivion, and there was no other solution.

Unfortunately, I had to copy my entire Garry's Mod to a separate file an re-install the game, I have it copied to several drives, so I should find a way to fix my game, as there was definitely something worse going on, as well. A large amount of textures have dissapeared into oblivion, and there was no other solution.

Unfortunately, I had to copy my entire Garry's Mod to a separate file an re-install the game, I have it copied to several drives, so I should find a way to fix my game, as there was definitely something worse going on, as well. A large amount of textures have dissapeared into oblivion, and there was no other solution.